Polyether modified silicone is a polyether - siloxane copolymer (siloxane copolymer for short) prepared by introducing polyether chain segment into siloxane molecule.Polyether - modified silicone defoamer is a new efficient defoamer which combines the advantages of both.It is to choose polyether with strong foam inhibition ability and dimethyl silicone oil with strong hydrophobicity and rapid foam breaking as the main components, matching silicone oil and polyether organic combination of emulsifier, stabilizer and other components composed of defoaming agent.It has the characteristics of low surface tension, rapid defoaming, long foam suppression time, low cost, less dosage, wide application and so on.Organosilicon was modified with polyether to make it have the advantages of second-class defoaming agent, and become a defoaming agent with excellent performance and wide application prospect.

    The siloxane segment is the hydrophilic group and the polyether segment is the hydrophilic group.In the polyether chain segment, the polyethylene oxide chain provides hydrophilicity and foamability, while the polyethylene oxide chain provides hydrophobicity and permeability, which has a strong effect on reducing surface tension.The groups at the end of the polyether chain also have great influence on the properties of the silicon ether copolymer.Common end groups are hydroxyl, alkoxy and so on.Adjusting the relative molecular weight of siloxane segment in copolymer can make copolymer highlight or weaken the characteristics of silicone.Similarly, changing the relative molecular weight of polyether segment will increase or decrease the proportion of organic silicon in the molecule, which will also affect the performance of copolymer.Polyether modified silicone defoamer is easy to emulsify in water, also known as "self emulsifying defoamer".Above the turbidity point temperature, it loses water solubility and mechanical stability, and is resistant to acid, alkali and inorganic salts. It can be used for defoaming under harsh conditions.

    In order to improve the lipophilicity of water-based inks, coatings and cutting fluids, part of methyl groups in the copolymer of polyether modified silicone are replaced by long chain alkyl groups, which can play a more effective defoaming effect.In order to make the following turbidity point temperature can also have better defoaming, commercial self-emulsifying defoaming agent is usually equipped with dimethyl silicone oil - white carbon paste, then at the turbidity point temperature polyether modified silicone surfactant can be used as the emulsifier of dimethyl silicone oil and play the role of dispersion, emulsification.